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Day 7 Part 1 Proper
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src/aoc2025/day7.clj
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src/aoc2025/day7.clj
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(map #(map first %)))}))
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(defn- split-beams [beams splitters]
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(->> (mapcat #(if ((set splitters) %) ((juxt dec inc) %) [%]) beams)
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set
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vec
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sort))
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(defn- unsplit-beams [in-beams out-beams]
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((comp sort vec) (set/intersection (set in-beams) (set out-beams))))
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(set (mapcat #(if ((set splitters) %) ((juxt dec inc) %) [%]) beams)))
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-
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; [7] [7] => [6 8]
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; [6 8] [6 8] => [5 7 7 9] => [5 7 9]
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(let [grid (->> "07.txt"
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util/read-file
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parse-file)
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;; [first-row & rest-rows] grid
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;; starting-point (get-start first-row)
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;; splitter-indexes (map (partial keep-indexed #(if (= %2 \^) [%1 %2] nil)) rest-rows)
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[_ & beam-splits :as all-beams] (reductions split-beams (:start grid) (:splitters grid))
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;; (defn- unsplit-beams [in-beams out-beams]
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;; ((comp sort vec) (set/intersection (set in-beams) (set out-beams))))
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]
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(defn- part1 [{start :start splitters :splitters}]
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(->> (map (fn [in-beams splitters]
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(count (set/intersection (set in-beams) (set splitters))))
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(-> all-beams drop-last)
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(:splitters grid))
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(->> splitters (reductions split-beams start) drop-last)
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splitters)
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(reduce +)))
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(defn- part2 [_] nil)
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(defn solve
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([] (solve "07.txt"))
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([fname]
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(->> fname util/read-file parse-file ((juxt part1 part2)))))
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(solve "07-test.txt")
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;(solve)